The Science Behind Our Recovery Model

Recovery Is Not One-Size-Fits-All

After a push-up session, your muscles need time to repair and adapt. But “take a rest day” is uselessly vague. A 10-rep session and a 100-rep session don’t need the same recovery time. Neither does a session of slow, controlled reps versus fast, explosive ones.

We built a recovery model that calculates a specific recovery window based on what you actually did — measured by your phone, not estimated by you.

The Additive Recovery Model

Our recovery estimate starts with a base period of 24 hours and adds modifiers based on session characteristics. This additive approach means the model is transparent — you can see exactly why your recovery time is what it is.

Base Recovery: 24 Hours

Exercise science consistently shows that muscular recovery from moderate resistance training takes approximately 24-48 hours. We use 24 hours as the base, representing a moderate session for an average user.

Intensity Modifier

Higher-intensity sessions require more recovery. We measure intensity through:

• Total volume (reps completed) — more reps means more mechanical stress
• Rep quality distribution — sessions with more full-depth reps are higher intensity than sessions dominated by partials
• Session duration — longer sessions under tension increase metabolic stress

A high-intensity session might add 2-6 hours to the base recovery time.

Fatigue Pattern Modifier

Our analytics track how your rep quality changes throughout the session. A session where quality deteriorates sharply in the last third indicates significant neuromuscular fatigue — your body needs more recovery.

If your fatigue curve shows a steep decline, the model adds additional recovery time. A flat fatigue curve (consistent quality throughout) suggests you stayed well within your capacity.

Tempo Modifier

Slow, controlled reps (longer eccentric phase) cause more muscle damage than fast reps — this is well-established in exercise science. The muscle fibers are under tension for longer, creating more micro-tears that need repair.

Sessions with slower average tempos receive a small positive modifier.

What We Don’t Do

It’s equally important to understand what our model avoids:

• No subjective inputs — we never ask “how do you feel?” or “rate your soreness.” These are unreliable, especially for beginners.
• No body composition guessing — we don’t estimate your fitness level or muscle mass from profile data.
• No cumulative fatigue modeling — the model treats each session independently. Cumulative overtraining detection would require validated research we haven’t yet implemented.

How It Shows Up in the App

After completing a session, you see a Recovery Countdown screen showing:

• Your estimated recovery time
• A countdown timer to full recovery
• A breakdown of the base + modifiers that produced the estimate

On the Home Screen, a Recovery Widget shows your current recovery status — whether you’re still recovering or ready for your next session.

The Honest Approach

We built this model to be useful without being misleading. It’s a simplified approximation of complex physiological processes. We don’t claim to predict your exact recovery to the minute. But a data-driven estimate based on what you actually did is significantly better than guessing or following blanket advice like “rest for 48 hours.”

The model will improve as we collect more data and can validate against longer-term performance trends. For now, it gives you a reasonable, transparent starting point for your training decisions.